Show me the steps to solve Use any high$-$level programming language you wish for the following programming exercise. Do not call built$-$in library functions that accomplish these tasks automatically.

$1)$ Write a function that receives a string containing a $16-$bitnary integer. The function must return the string$$s integer value.

$2)$ Write a function that receives an integer. The function must return a string containing the hexadecimal representation of the integer.